Questions tagged [error]
The error tag has no usage guidance.
185
questions
0
votes
0answers
16 views
Error: The send transactions “from” field must be defined!
I get this error, even though I do specify the transaction sender.Here is my code:
for(let a=1; a<TEST_ORACLES_COUNT; a++) {
await config.flightSuretyApp.registerOracle({from: accounts[a], ...
0
votes
0answers
21 views
Type error, unit256 is not implicitly convertible to expected type struct
Using sol compiler 0.5.1
I am trying to fetch data from old smart contract's function called people, the smart contract is already deployed on the blockchain
mapping(address => Person ) public ...
0
votes
0answers
16 views
Trying to deploy a simple contract using node and getting the error: Unhandled Promise Rejection / Contract code couldn't be stored
I am doing an online course and trying to deploy using node. Can anyone help ID what I might be doing wrong. Thank you for any help! The error is below, followed by the js code.
iii@iii:~/Digital ...
0
votes
1answer
51 views
While testing wrap & unwrap of ETH to WETH on Kovan ,however the wrap function is fine but unwrap func fails,is anything wrong in my approach?
trx fails at
& debug at tenderly
pragma solidity 0.5.12;
contract WETH9_
{
mapping (address => uint) public balanceOf;
mapping (address => mapping (address => ...
0
votes
0answers
20 views
How to deploy huge contracts using web3?
I have a huge contract (which exceeds the default contract code size set in Quorum). I have increased the Code size and Transaction size in the Genesis file to 128Mb. The contract works well when ...
2
votes
0answers
25 views
Are there well-solved patterns and practices for handling errors in Solidity?
In the spirit of Are there well-solved and simple storage patterns for Solidity?...
Are there known, battle-tested practices for how to deal with errors in large Solidity codebases?
It's common in ...
0
votes
1answer
20 views
Getting this error `ValueError: {'code': -32000, 'message': 'insufficient funds for gas * price + value'}` on raw transaction send
I know for sure I have enough eth on account. Some prelims:
I am signing a raw transaction with web3.py, like so:
transaction = {
'to': '0xSENDHEREFINALLYPLEASE',
'value': 1000,
'gas': ...
0
votes
1answer
41 views
Error when sending multiple transactions
I'm having a weird issue with the code below in that sometimes it works and sometimes it doesn't. It seems more apparent when TRANSACTIONS is set to a larger number. I have had it fail AND pass with ...
2
votes
1answer
296 views
Uniswap V2 smart contract integration reverts attempt at swapping ETH for tokens
I'm trying to integrate Uniswap V2 into my contract but my attempts at making a trade (ETH to Token) always gets reverted.
Here is my solidity code:
pragma solidity ^0.6.0;
// Included the ...
0
votes
0answers
31 views
deployment error
everyone!
Doing Dapp on Etheryum.
When the contract was deployed, the Error: The data field must be HEX encoded data began to fly out.
I do it on a site under Web3 \ JS. Thought the old js resource. ...
0
votes
0answers
68 views
Why error 'Fail with error 'Storage: Unpermissioned operator <0xc3d5d60630bc63eb1a07228cc5028cada1cc4c7b>' arises?
I wants to deposit & withdrawal DAI
(https://kovan.etherscan.io/address/0xc4375b7de8af5a38a93548eb8453a498222c4ff2)
to SOLO Margin(dydx) smart Contract at Kovan testnet (https://kovan.etherscan....
0
votes
1answer
14 views
When i am doing migration, the netwrok name is ganache instead of development and multiple errors are there
D:\>truffle migrate --reset
Compiling your contracts...
===========================
> Compiling .\contracts\Migrations.sol
> Artifacts written to D:\build\contracts
> Compiled ...
1
vote
1answer
54 views
Error: Invalid bytes6 value
I'm trying to create a TicketPurchaser application. Here is the whole code for the smart contract, although I think the problem I'm asking about is a type error, most of the code is not important.
...
1
vote
1answer
25 views
Public / Internal modifier spawns error: This type is only supported in the new experimental ABI encoder [duplicate]
I have this code snippet:
pragma solidity >=0.5.0 <0.7.0;
import "@aztec/protocol/contracts/libs/NoteUtils.sol";
library EscrowUtils {
using NoteUtils for bytes;
struct Note {
...
1
vote
0answers
46 views
Unexpected fault address
I picked up an Ethereum Blockchain at AWS ECS almost 3 months ago, it was working perfectly until I got this bug yesterday from the mining node:
unexpected fault address 0x7fb93c71d000
[signal SIGBUS:...
0
votes
2answers
30 views
Etherscan says there is not enough ether, why?
Etherscan says there is not enough ether, why? Arguments, which i enter => requestLoan(3,31,3) and after change account, provideGuarantee(0,3)
I have created dApp and how it looks in my code you can ...
0
votes
1answer
2k views
Getting error -> unexpected token. You may need an appropriate loader to handle this file type
root@kali:~/Documents/oraclize-test# npm run dev
truffle-oraclize-api@0.0.2 dev /root/Documents/oraclize-test
webpack-dev-server
ERROR in ./app/javascripts/app.js
Module parse failed: /root/...
1
vote
1answer
297 views
truffle unbox pet-shop gives DownloadingError: read ECONNRESET at TLSWrap.onStreamRead (internal/stream_base_commons.js:201:27)
Ubuntu 18.04.
Truffle v5.1.2 (core: 5.1.2)
Solidity v0.5.12 (solc-js)
Node v13.2.0
Web3.js v1.2.2
When I execute truffle unbox pet-shop on terminal, I get error
✔ Preparing to download
⠼ ...
2
votes
1answer
38 views
Solidity. Find whether a key exists in a mapping. Then get its value
I have a simple mapping:
mapping(address => string) professorsExam;
How can I check if msg.sender is a key in this mapping, and if it is, get its value? If it isn't I should return something.
...
1
vote
1answer
111 views
Issue with selfdestruct() getting an error
main contract function which calls my secondary contract
function gameOver(uint _matchId)public payable onlyOwner returns(bool) {
Match my_match = Match(matchTracker[_matchId]);
bool success ...
0
votes
1answer
79 views
invalid implicit conversion from contract to address requested contract
I am using this function to create a new contract instance of Match contract which takes 4 parameters.
However i am getting this error message "invalid implicit conversion from contract to address ...
0
votes
2answers
40 views
Assertion error running truffle test
I can't seem to understand where this error comes from. Maybe someone can help
My token solidity file :
pragma solidity >=0.4.2 <0.6.0;
contract LairToken {
//Name
string public ...
0
votes
0answers
66 views
Error: Returned values aren't valid, did it run Out of Gas based on YT Tutorial
I red the other Threads about this case, but couldn't fixed the problem.
I got this tutorial for Scmart contracts:
https://www.youtube.com/watch?v=coQ5dg8wM2o&feature=youtu.be
However the ...
1
vote
0answers
26 views
0
votes
0answers
59 views
How can MetaMask alert about transaction errors before they are caused?
The MetaMask extension has this feature to warn about transaction errors before a transaction is being made:
ALERT: Transaction Error. Exception thrown in contract code.
How is this done? A dry ...
0
votes
0answers
21 views
Geth error: Genesis not found in chain - error on the worker node!
Good afternoon. After restarting the server when trying to run get I get an error. Start command:
geth --rpc --rpcport 8545 --rpccorsdomain "*" --rpcapi "db,eth,net,web3,personal" --cache 8192 --...
0
votes
1answer
119 views
rpc error with payload and exception thrown in contract code
This is the problem I get when trying to run my contract!
And then when I go ahead and run it, this pops up
This is my js code:
import React, { Component } from 'react';
import Web3 from 'web3';
...
0
votes
3answers
386 views
Remix Deploy Error encoding arguments
I'm building a simple fund raising smart contract and having problems deploying this through Remix. I'm wanting to set the "goal" and "minimum contribution" values (in wei) during the contract ...
-3
votes
2answers
113 views
Trying to create an instance of an abstract contract
pragma solidity ^0.5.0;
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol';
contract SubToken{
mapping(address => uint) balances;
...
2
votes
1answer
172 views
How does one retrieve revert/require error messages from RPC
In both of these questions, the user is asking if it's possible to get the error string from a revert or require. The answers say, basically, "Yes" and point to Truffle or other methods.
VM Exception ...
0
votes
1answer
142 views
create ERC-20 token from a contract function
I would like to do a function create contract with ERC-20 interface.
But I have a few problems.
If anyone help me I’ll be appreciated.
Here’s the code :
pragma solidity ^0.5.0;
import 'https://...
0
votes
1answer
81 views
create contract from function / contract
**Hey guys !
I just try to make a contract for create a contract.
It supposed to be ERC-20 interface so my first contract for this.
But I don’t know how can I do _mint and createContract functions
...
0
votes
1answer
43 views
Expected identifier but got reserved keyword 'reference' Product public reference; ^-------^ [closed]
hello guys I am a beginner.
I would like to make a function for create a contract.
I found a example on the internet but gives me an error so I dont know what should I do.
Anyone can help me ?
...
1
vote
2answers
318 views
Error: gas required exceeds allowance or always failing transaction in Remix using Ropsten network
I am facing this error
, My Contract is quite simple
pragma solidity ^0.5.0;
contract sendEther {
address payable sender;
function showReceiver() public view returns (address payable) {
...
0
votes
2answers
21 views
it'll give me a parser error
pragma solidity ^0.5.0;
contract fisrtCoin {
address deployer;
mapping(address=>uint) balances;
public function fisrtcoin() {
deployer = msg.sender;
}
public ...
0
votes
1answer
204 views
'types/values length mismatch',
Hey guys I had a problem with my return function
here's my smart contract :
pragma solidity >=0.4.0 <0.7.0;
contract NewHello{
address owner;
address newOwner;
constructor()public{
...
1
vote
1answer
703 views
Function declared as view, but this expression (potentially) modifies the state requires payable
I'm trying to change the an address data variable to a one, which is selected via a function.
Keep getting the below error.
Function declared as view, but this expression (potentially) modifies the ...
0
votes
3answers
694 views
ParserError: Expected ',' but got identifier
pragma solidity >=0.4.0 <0.7.0;
contract NewHello{
struct kullanicilar{
string name;
string surname;
uint age;
}
event infoChanged(
string name,
...
1
vote
0answers
366 views
Etherscan says “we were unable to locate a matching bytecode (err_code_2)”
Please help me with this error...
I dont know what is it?
0
votes
1answer
487 views
Transaction Error. Exception thrown in contract code. (MetaMask)
When I use Ganache it runs with no problem and MetaMask too. When I run my contract in my private Ethereum network (Geth). When I use a function from my contract the MetaMask gives me this error (...
0
votes
0answers
37 views
Get the address of a contract without using Remix-ide
I'm studying Ethereum, I need to get the contract address for interact with web3, I can not use Remix-IDE for this since that I installed Kali as an operating system. How I get the contract address ...
2
votes
2answers
390 views
Syntax Error: Type tuple(bool,bytes memory) is not implicitly convertible to expected type bool
I am trying to compile the following program:
pragma solidity ^0.5.1;
contract MKotET1_1{
address payable king; uint public claimPrice = 100;
function calculateCompensation() public ...
1
vote
1answer
44 views
call: Warning: Unused local variable
I am trying to compile the following code:
pragma solidity ^0.5.1;
contract MKotET1_1{
address payable king; uint public claimPrice = 100;
function calculateCompensation() public returns(uint)...
2
votes
1answer
30 views
I have a ParserError here “function Stratus(string _greeting) {”
pragma solidity ^0.4.19;
contract Stratus {
string public greeting;
address public owner;
event GreetingChanged (string oldGreeting, string newGreeting)
function Stratus(string ...
0
votes
2answers
462 views
Type uint256 is not implicitly convertible to expected type int256
I'm trying to compile the following keep getting an error, even though used this before in second code and its working fine.
Simply trying to change the temp to the new temperature set by the user, so ...
1
vote
1answer
703 views
MetaMask - RPC Error: Error: WalletMiddleware - Invalid “from” address
I'm trying to create a simple Dapp (via tutorial) which would allow me to send Ether from sender to receiver (via a contract with an address that automatically approves the transaction). The truffle ...
1
vote
0answers
25 views
How to process null TransactionReceipt?
I have some transaction that is sent and from time to time when I call the eth_getTransactionReceipt I get a null.
I see esentially two approaches for handling this:
I could reiterate the call to ...
0
votes
1answer
843 views
TRUFFLE MIGRATE: Saving migration to chain.Error: Error: Error: Returned error: VM Exception while processing transaction: invalid opcode
$ truffle migrate
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Starting migrations...
======================
> Network name: ...
1
vote
0answers
98 views
Using web3j with infura returns null
I've used web3.js to handle my contracts, and it worked very well.
But web3j is pretty hard for me since the beginning.
I'm using android studio, infura, web3j.
Since I don't know very much about ...
0
votes
0answers
33 views
DeclarationError: Undeclared Identifier. Did you mean “_data”? data = _data ^__^. All i want is to create a cryptocurrency
pragma solidity ^0.5.1;
contract owner {
address public owner;
function owned() public {
owner = msg.sender;
}
function set( string memory _data) public {
data = ...
